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Monitoring CCA Landfill Disposal Impact in PVC Columns

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Study simulating landfill disposal of CCA using PVC columns. Explore different disposal scenarios and compositions. Monitor leachate, gas production, and environmental parameters to assess impact.

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Monitoring CCA Landfill Disposal Impact in PVC Columns

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Presentation Transcript

  1. Lysimeter Study • Simulate landfill disposal of CCA • 6 PVC Columns • 22 feet high, 1-Foot diameter • Natural Precipitation infiltrates through a cap and creates leachate

  2. Disposal Scenarios • CCA Monofill • Construction and Demolition (C&D) Landfill • Municipal Solid Waste (MSW) Landfill

  3. Construction

  4. Lysimeter Construction Layers

  5. Filling

  6. Lysimeters • Lysimeter 1 – Untreated wood • Lysimeter 2 – CCA: 50% old, 50% new • Lysimeter 3 – Typical C&D mix • Lysimeter 4 – C&D w/CCA • Lyimeter 5 – MSW w/untreated wood • Lysimeter 6 – MSW w/CCA

  7. Monofill Disposal • No interaction of other materials with the CCA • Lysimeter 1 – Control • Lysimeter 2 – Experimental • Densities • Lysimeter 1 – 593.6 pcy • Lysimeter 2 – 544.6 pcy

  8. Lysimeter 1

  9. Lysimeter 1 Composition by Weight

  10. Lysimeter 2

  11. Lysimeter 2 Composition by Weight

  12. C&D Landfill Disposal • Where typically managed in FL, landfills unlined • Lysimeter 3 – Control • Lysimeter 4 – Experimental • Densities • Lysimeter 3 – 580.2 pcy • Lysimeter 4 – 603.6 pcy

  13. Lysimeter 3

  14. Lysimeter 3 Composition by Weight

  15. Lysimeter 4

  16. Lysimeter 4 Composition by Weight

  17. MSW Landfill Disposal • Landfills lined, more expensive than C&D landfills, smaller portion of waste stream • Lysimeter 5 – Control • Lysimeter 6 – Experimental • Densities • Lysimeter 5 – 494.5 pcy • Lysimeter 6 – 493.0 pcy

  18. Lysimeter 5

  19. Lysimeter 5 Composition by Weight

  20. Lysimeter 6

  21. Lysimeter 6 Composition by Weight

  22. Monitoring • Lysimeters began operation on August 28 (Wood, C&D) and September 27, 2002 (MSW) • Weather station records temp, rainfall, wind speed, etc. on a continuous basis • Weekly temperature taken inside the lysimeters at 3 different depths (5, 10, 19 feet from the top of waste)

  23. Monitoring • Collect leachate when generated and analyze for general water quality prameters and As, Cu, and Cr • Record volume and characterize gas produced • Test gas with Landtec Gem 500 (methane, CO2) and Jerome (H2S)

  24. Preliminary Results • Weekly Temp monitoring fluctuates with ambient temps • Weekly gas monitoring – methane just detected in MSW lysimeters in last month • Leachate generated from lysimeter 2 only, collected three dates

  25. Lysimeter Temperatures

  26. Preliminary Results – Lysimeter 2

  27. Future • Experiment and monitoring will continue through next May (at least) • Once leachate is generated, gas will be monitored more frequently • Natural precipitation will continue to be used, unless not enough leachate generated

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